Figure 3: Effect of different drug on the death of Pheretima posthuma. Different groups of Pheretima posthuma (n = 5) were treated with either control or piperazine (10 mg/ml) or Sankat Mochan (1%, 5%, 10%). Time (in min) taken for death was recorded. Each bar represents mean ± standard error of mean of data from five animals. ***P < 0.0001 versus control and ###P < 0.0001 versus standard (one-way repeated measures analysis of variance followed by Newman–Keuls multiple comparisons test)